automorphism: Meaning and Definition of

au•to•mor•phism

Pronunciation: (ô"tu-môr'fiz-um), [key]
— n. Math.
  1. an isomorphism from a given set to itself. Cf. inner automorphism, outer automorphism.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.